Push-button switch



May 24, 1927.

J. VALERIUS PUSH BUTTON SWITCH Filed June 11, 1925 Patented May 24, 1927.

; UNITED .s'rATEs' PATENT OFFICE.

30m 7W8, or U, GM-

roan-rumor swrrcn.

Application fled lane 11, 1985.v Serial Io. 86,646.

- My invention relates to a push button switch in which the circuit is closed by shoving the push button into the switch casing, and is interru ted by drawing the push butt'on out of said casing. The gist of the in- "vention resides therein that stationary and between the stationary ones whenthe push buttonhas been depressed, the mov-- able contact piecebein then in contact with as shifted axially;'Figure 5 is a horizontal the stationary ones w ereby'thecircuit is kept closed until the button is withdrawn.

A modification is devised in which the movable contact member is rotatory instead of axially movable, and both directions of motions ma be combined with one another, especially in the case of series switches, as is all more fully described hereinafter.

My invention is illustrated diagrammatically and by way of example in the accompanying drawing in which Figure 1 is an axial section through a switch devised according to this invention; the switch being shown in that position in which the circuit is broken; Figure 2 is a similar illustration,

the movable parts being, however, in that position in which the circuit is closed; Figure 3 shows a modification of the switch, the circuit bein closed, as in Fig. 2; Figure 4 shows anot er modification, in which the shank of the switch can be turned, as well section in the lane 1-2 of Fig. 4; and Figure 6 showsa so a modification.

Referring first to Figs. 1 and 2, a denotes a box, 6 a cover there or, and 0 screws for afiixing said cover to said box. d d are elastic curved contact members aflixed to the bottom of the box a, and e e are the conduct-' ing wires which are connected withsaid contacts. f is a stationary clamping member having a central bore, the circumferential wall of which is curved so as to be concave. This member is located between the screws securing the springs 41 d to the bottom of the box. Said member f is located centrally in this bottom.

The cover b is provided with a neck having abore h in which is located an shiftable bolt or shank Z, to the up r end of which a push-button I: is atiixed? Also thls push-button proper or head is provided with a neck, and this neck fits into the bore 1!. of the neck 9 of the cover 6. Within the box ,a the shank Z is provided with a contact disk "In, and below this disk the shankis rendered elastic in such a manner that it or, more precisely, its end can be retained in the bore of the bottom, clamping member f; n

denotes this part of the shank. When the button is is depressed, .the somewhat enlarged or ball-shaped end of the part n enters into the member 7 and is retained therein elastically, and at the same time the disk m. is in contact withthe springs d d whereby the wires e e are conductively connectedwith each other. Besides, also at the same time a helical spring z located in the neck 9 of the cover I) and encompassing the shank l is compressed, but this compressed spring is not strong enough to withdraw the clamping member n from the clamping member The object proper of the'springz' is to keep the disk m off the contact springs d (1 when the clamping members f and n havebeen disconnected by drawing the neck of the button or head In out of the neck g.

The modification shown in Fig. 3 difiers from Figs. 1 and 2 chiefly in the feature that the position of the clamping members (f and 11, Figs. 1 and 2) is inversed, that is to say, the member I is dispensed with, and instead thereof a cavity or bore is provided in the lower end of the shank bearing the push-button, and instead of an axially shiftable clamping member n a stationary clamping member a is secured to the bottom of the box, the enlarged free end of this member n being intended to enter into the cavity or bore Z in order to retain the contacts in closed position.

There are,in the-two constructional forms illustrated in 13, two springs d, or d respectively. hese switches are not series switches. In theca-se of series switches at least three contact springs are required and onethereof must remain out of contact when the switch is closed, there being always t e is'shown in Figs. 4 and 5 in whichthe oon tac't disk m is provided with arecess'o and can be turned in its plane and can be secured in any of its tial positions. The shank y l is square in ores-section and the cover 011 an internal shoulderof the cover 6. spring 1s stronger than the spring t.

b is provided with undulated springs p. There are two such springs arranged in opposite position, and they contact always with two of the four sides of the square shank so as to retain this latter in the position it just assumes. The size of the bore hin the neck 9 of the cover I) is such that the shank in question can freely turn therein. The sha e of the undulated springs p, as well as of t e recess 0, is such that the disk 0 can be turned as desired without any risk of the disk being prevented from turnlng by said sprin s.

,Lwish itfhowever, to be understoo that instead of the recess 0 a sector of an insulated material and of the same size and shape may be employed, in which. case the disk'may be turned in one or the other direction either before it has been depressed or thereafter.

In order to facilitate the use of the switch marks may be provided upon the knob k and upon the neck marks bein such t at they permit to ascertain whic of the circuits has been closed.

Fig. 6 shows a constructional .form in which means are provided to throw the switch more quickly out of circuit in order to prevent the arising of an'arc. The ressure contact is composed of a hollow s ank Z which is firml connected with the contact disk m an the clamping member a which co-operates with a counter-member f in the same manner as has been described with respect to Figs. 1 and 2. The pressure is composed further of a pin g screwed into the knob k and hearing at its lower end a small disk 8 upon which bears a helical spring t, the other end of which contacts with the top part of the shank P in which there is a bore 1' for the passage of the in (I. Said top part has a. flange below whic is a helical spring i hearing at its lower endrlip- The spring t tends to move the pin q downwards and to press the knob 1: against the top part of the shank Z, but this shank is pressed upwards or outwards by the stronger; spring 2', the extent of-this movement being such that the contact disk m touches the bottom surface of. the cover b. Fig. 6 shows the movable members of the switch infthat position'in which the circuitis closed. When theknob k is pulled forward, first the weaker; s ring t is compressed so that the contact tween the disk m and the contact s rings d is not broken although the kno has nearly reached 12 the position of said the end of its outward path. Only when the sprin t hasbeen compressed completely, the pull 1s transmitted to the shank Z, and the spring i can now fling the shank suddenly forward along the pin 9, when the circuit will be broken at once and no at will arise. I

It is obvious that also this constructional form of the switch can be so devised as to the combination of aclosed switch casing, a

pair of curved contact plates mounted in spaced relation-on the bottom plate of said casing and insulated from each other, a spring-controlled push button movably mounted in the top plate of said closed casing, a contact plate on the lower end of said push button, a central female clamping member in the said bottom late, an elastic male clamping member on t e other contact element said clamping members being made to en age the one with the other when said push utton is being depressed so that'said contact plate is held in contact with said contact sprin 2. In a switch of the character described the combination of a closed switch casing,

a bottom plate in said casinghavinga central clamping socket, a pair of curved contact springs mounted in spaced relationon said" J OHANN VALERI US. 

